java中年月日怎样比较大小
发布网友
发布时间：2022-04-26 21:53
共4个回答
热心网友
时间：2023-11-07 13:47
用毫秒比较，虽然是伪毫秒，但是相当精确
String date1 = "2007-10-12 18:35:00";
String date2 = "2008-10-12 18:35:00";
String pattern ="yyyy-MM-dd hh:mm:ss";
SimpleDateFormat sf = new SimpleDateFormat(pattern);
Date d1 = sf.parse(date1);
Date d2 = sf.parse(date2);
if(d1.getTime() > d2.getTime()){
System.out.println("date 1 > date 2");
}else{
System.out.println("date 1 < date 2");
}
热心网友
时间：2023-11-07 13:48
如果是Date类型把他转化成String类型比较，直接用String里的方法
strA.compareTo(strB)就可以 >0 strA的时间在后，<0 相反， =0时候两个时间相等
热心网友
时间：2023-11-07 13:47
用毫秒比较，虽然是伪毫秒，但是相当精确
String date1 = "2007-10-12 18:35:00";
String date2 = "2008-10-12 18:35:00";
String pattern ="yyyy-MM-dd hh:mm:ss";
SimpleDateFormat sf = new SimpleDateFormat(pattern);
Date d1 = sf.parse(date1);
Date d2 = sf.parse(date2);
if(d1.getTime() > d2.getTime()){
System.out.println("date 1 > date 2");
}else{
System.out.println("date 1 < date 2");
}
热心网友
时间：2023-11-07 13:48
一楼走弯路了,Date类型就可直接比较的,
Date a=...
Date b=...
int i=a.compareTo(b);
if(i>0)...
else if(i<0)...
else ...
热心网友
时间：2023-11-07 13:49
/**
* Compares two Dates for ordering.
*
* @param anotherDate the <code>Date</code> to be compared.
* @return the value <code>0</code> if the argument Date is equal to
* this Date; a value less than <code>0</code> if this Date
* is before the Date argument; and a value greater than
* <code>0</code> if this Date is after the Date argument.
* @since 1.2
* @exception NullPointerException if <code>anotherDate</code> is null.
*/
public int compareTo(Date anotherDate) {
long thisTime = getMillisOf(this);
long anotherTime = getMillisOf(anotherDate);
return (thisTime<anotherTime ? -1 : (thisTime==anotherTime ? 0 : 1));
}
参考DATE源代码..
热心网友
时间：2023-11-07 13:48
如果是Date类型把他转化成String类型比较，直接用String里的方法
strA.compareTo(strB)就可以 >0 strA的时间在后，<0 相反， =0时候两个时间相等
热心网友
时间：2023-11-07 13:48
一楼走弯路了,Date类型就可直接比较的,
Date a=...
Date b=...
int i=a.compareTo(b);
if(i>0)...
else if(i<0)...
else ...
热心网友
时间：2023-11-07 13:49
/**
* Compares two Dates for ordering.
*
* @param anotherDate the <code>Date</code> to be compared.
* @return the value <code>0</code> if the argument Date is equal to
* this Date; a value less than <code>0</code> if this Date
* is before the Date argument; and a value greater than
* <code>0</code> if this Date is after the Date argument.
* @since 1.2
* @exception NullPointerException if <code>anotherDate</code> is null.
*/
public int compareTo(Date anotherDate) {
long thisTime = getMillisOf(this);
long anotherTime = getMillisOf(anotherDate);
return (thisTime<anotherTime ? -1 : (thisTime==anotherTime ? 0 : 1));
}
参考DATE源代码..
